Question

Which of the following statements is incorrect?

• A. Endodermis is impervious to water due to the presence of suberized Casparian stips
• B. Xylem vessels and tracheids, being non-living, are parts of the apoplast
• C. Ascent of sap is best explained by root pressure theory
• D. None of these

Answer 1

Answer: (C)

Cohesion tension theory (Cohesion-tension and transpiration pull theory) explains the ascent of sap best. It was put forward by Dixon and Jolly in 1894. It was further improved by Dixon in 1914. Therefore, the theory is also named after him as Dixon's theory of ascent of sap. Today most of the workers believe in this theory